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“Spin transfer torque devices utilizing the giant spin Hall effect of tungsten.” C.-F. Pai, L. Q. Liu, Y. Li, H. W. Tseng, D. C. Ralph and R. A. Buhrman. Appl. Phys. Lett. 101, 122404 (2012). http://dx.doi.org/10.1063/1.4753947

“Spin Torque Study of the Spin Hall Conductivity and Spin Diffusion Length in Platinum Thin Films with Varying Resistivity,” M. H. Nguyen, D. C. Ralph, and R. A. Buhrman, Physical Review Letters 116 (2016), Artn 126601, https://doi.org/10.1103/PhysRevLett.116.126601.